Claire should use *blank* lines to show shapes and proportions.

Claire should use guidelines to show shapes and proportions. Guidelines are horizontal and vertical lines that can be lightly sketched to help define the shapes and sizes of objects within a composition. They act as a framework that assists in maintaining accurate proportions and symmetry.

To create guidelines, Claire can start by visualizing the general shapes and proportions she wants to portray in her artwork. Next, she can lightly sketch horizontal and vertical lines to serve as reference points. These lines can be adjusted as she refines her composition and draws the objects within it.

By using guidelines, Claire can ensure that her artwork accurately represents the shapes and proportions she intends to depict, providing a strong foundation for her artistic expression.